package frontend.ast.exp;

import frontend.ast.Node;
import frontend.ast.NodeStack;
import frontend.ast.SyntaxType;
import frontend.lexer.TokenStream;
import frontend.lexer.TokenType;
import frontend.ast.token.TokenNode;
import error.Errors;

public class LAndExp extends Node {
    public LAndExp(TokenStream ts) {
        super(SyntaxType.LAND_EXP, ts);
    }

    public void parse(Errors errors) {
        NodeStack stack = new NodeStack();
        while (true) {
            EqExp eep = new EqExp(this.ts);
            eep.parse(errors);
            stack.push(eep);
            if (getCurrToken().getType() == TokenType.AND) {
                stack.push(new TokenNode(ts)); // landop
            } else {
                break;
            }
        }
        if (stack.size() == 1) {
            this.addChild((EqExp)stack.pop());
        } else {
            LAndExp temp = this;
            while(stack.size() > 1) {
                LAndExp lae = new LAndExp(this.ts);
                EqExp eep = (EqExp)stack.pop();
                TokenNode landop = (TokenNode)stack.pop();
                temp.addChild(lae);
                temp.addChild(landop);
                temp.addChild(eep);
                temp = lae;
            }
            temp.addChild((EqExp)stack.pop());
        }
    }
}